Marine engineering structures are continuously exposed to high salt spray, high humidity, and persistent chloride ion attack. Under these conditions, thermal spray zinc coatings primarily rely on sacrificial anode mechanisms for corrosion protection.
Zinc wire purity typically ranges from 99.9% to 99.995% industrial grades. Different purity levels affect the electrochemical stability of zinc in seawater environments.
High-purity zinc wire generally exhibits more uniform corrosion consumption behavior, while lower-purity materials may generate localized potential differences due to impurities.
Impurities such as iron, lead, or oxides in zinc wire may alter surface reaction pathways. These impurities create micro-electrochemical zones that accelerate localized oxidation.
In salt spray environments, this effect becomes even more pronounced.
During thermal spraying, the melting uniformity of zinc particles directly affects coating density. If material purity is inconsistent, pores or micro-crack pathways may form.
These structural defects accelerate oxygen and chloride penetration, increasing oxidation rates.
Fluctuations in current, voltage, spray distance, and air pressure affect particle deposition quality. Instability may result in locally porous coatings.
High humidity accelerates electrochemical reaction rates, while salt deposition forms a continuous conductive medium that speeds up oxidation.
Insufficient blasting reduces coating adhesion strength, indirectly accelerating oxidation pathways.
Using 99.9%–99.995% zinc wire is recommended to reduce impurity-induced localized electrochemical reactions.
±0.01mm diameter control helps maintain particle uniformity during spraying.
Low-oxidation and low-contamination surfaces reduce initial corrosion site formation.
Accelerated oxidation in marine zinc coatings cannot be attributed solely to zinc wire purity grade; it is the combined result of material performance, application process, and marine environmental conditions.
However, among all factors, zinc wire purity grade remains a key variable influencing electrochemical stability and coating uniformity.
담당자: Mr. xie
Korean
